Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quem é o gerente de saída do Birmingham City?
 ###Tabelas: CREATE TABLE scaled_taxation (scaled_taxation_id AUTO_INCREMENT PRIMARY KEY, Currency Bracket: VARCHAR, Dollars Taxed in Bracket: VARCHAR, Rate: VARCHAR, Taxes From Bracket: VARCHAR, After Tax Income: VARCHAR, Percentage of Income Kept: VARCHAR) CREATE TABLE singles:_16_9–7 (singles:_16_9–7_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Opponent VARCHAR, Score VARCHAR) CREATE TABLE managerial_changes (managerial_changes_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Outgoing manager VARCHAR, Manner of departure VARCHAR, Date of vacancy VARCHAR, Replaced by VARCHAR, Date of appointment VARCHAR, Position in table VARCHAR) CREATE TABLE 1970s_eagles_15-4-1 (1970s_eagles_15-4-1_id AUTO_INCREMENT PRIMARY KEY, Year INT, Date VARCHAR, Winner VARCHAR, Result VARCHAR, Location VARCHAR) CREATE TABLE academy_graduates_2000–present (academy_graduates_2000–present_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Current Club VARCHAR, Born VARCHAR, Debut VARCHAR, Manager VARCHAR)  
SELECT Outgoing manager FROM managerial_changes WHERE Team = birmingham city